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MakePW.com is a service that generates
secure, random passwords, 24/7.
Default password-length is 16 characters and can be adjusted
from 8 - 128 characters. There's also an option to get the
password-list as plain ascii-text file or access an RESTful
API that creates JSON or YAML - output.

This webapp works with javascript disabled, except for
navigation on smartphones; you
still are able adjust the value for password-length manually and
choose between 8 and 128 characters the following way:
https://makepw.com/32/